It reduces grown men to tears and has been described as “one of the worst pains known to man”.

Husband-to-be Nathan Jack has spoken about his battle with a chronic condition so painful it has left him unable to work, drive and even forced him to put his wedding on hold - even with an anonymous donation of £10,000.

The 29-year-old, from Gosforth, Newcastle, described how his life has been turned into a living hell by ‘cluster headaches’, which can leave him in unbearable pain for anything from 15 minutes to three hours.

Nathan has suffered from a neurological disorder since having a brain tumour as a teenager.

But over the past three years his condition has deteriorated to the point where he now suffers up to seven debilitating attacks a day.

Nathan Jack

Cluster headaches, which affect around one in 1,000 people worldwide, cause excruciating pain on one side of the head.

They are due to get married in April 2017 at Le Petit Chateau in Otterburn, Northumberland, however plans are on hold with Nathan only receiving statutory sick pay.

Nathan and Natalie are temporarily staying with her parents in West Denton to ensure he isn’t left alone during the day, as he sometimes punches himself in the face during a seizure.

He said: “As well as physically, it’s affected me mentally because I’m used to being active - going to the gym and socialising with friends - but at the minute I can’t do any of that.

“Natalie and I got engaged two years ago and we’ve been planning the wedding for a while, but sadly at the moment it’s on hold because I can’t get married like this - an attack can happen to me at any time.”

WARNING: this video may upset some readers. It shows Nathan suffering an attack and screaming in very severe pain. Nathan has asked the Chronicle to publish his video to show what he goes through.

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Last week, Nathan took the brave decision to post a powerful video on social media showing one of his attacks in a bid to raise awareness.

Nathan said: “There is no known cure, only preventative treatments – a number of which I have tried with no luck as of yet.

“As hard as it was for me to share personal footage, I felt people need to know what cluster headache sufferers go through on a daily basis because without seeing it, you can’t fully understand.

“This condition is in desperate need of recognition and I am hoping to have surgery as soon as possible to get it under control but there is a limited number of neurologists in the UK trained to carry out the operation.”

After seeing it, friend Ryan Hill set up a fundraising page to secure Nathan a life-changing operation ahead of the wedding date.

Ryan is hoping to raise the full cost of an operation to go private, explaining that the waiting time on the NHS is six months – a timeframe Nathan is not able to wait for in his current state.

The page has amassed over £24,000 since it went live, with an anonymous £10,000 donation bringing the £40,000 target well within reach.

Nathan said: “The response has been absolutely incredible, and it means a lot to know I’m getting through to people.”